<template>
  <div>
    <div class="todo-container">
      <div class="todo-wrap">
        <Header :addNewTodo="addNewTodo" />
        <List
          :todoList="todoList"
          :singleCheckHandle="singleCheckHandle"
          :singleDeleteHandle="singleDeleteHandle"
        />
        <Footer 
        :todoList="todoList" 
        :checkAllHandle='checkAllHandle'
        :deleteAllChecked='deleteAllChecked'
        />
      </div>
    </div>
  </div>
</template>

<script>
import Header from "./components/Header";
import List from "./components/List";
import Footer from "./components/Footer";

export default {
  name: "App",
  components: {
    Header,
    List,
    Footer,
  },
  data() {
    return {
      todoList: [],
    };
  },
  methods: {
    // 1.添加要做的事情
    addNewTodo(newTodo) {
      this.todoList.unshift(newTodo);
    },
    // 2.单个选中 修改done
    singleCheckHandle(id) {
      // map -- 映射 ，返回一个新的值覆盖旧的
      this.todoList = this.todoList.map((item) => {
        // 当前id 跟 选中的id相等，则done取反
        return item.id === id ? { ...item, done: !item.done } : item;
      });
    },

    // 3.单个删除
    singleDeleteHandle(id) {
      // confirm ---取消确认弹窗
      const isDelete = confirm("确定删除吗");
      if (!isDelete) return;

      // filter --- 过滤，返回一个布尔值
      // id不相同的留下
      this.todoList = this.todoList.filter((item) => item.id !== id);
    },

    // 4.全选按钮逻辑
    checkAllHandle(done) {
      this.todoList = this.todoList.map((item) => {
        return { ...item, done: done };
      });
    },

    // 5.删除所有已完成事件
    deleteAllChecked(){
      this.todoList = this.todoList.filter(item=>{
        return !item.done
      })
    }
  },
  // 挂载
  mounted() {
    // 本地存储 字符串形式
    this.todoList = JSON.parse(localStorage.getItem('todoList')||'[]')
  },

  // 监听
  watch:{
    todoList:{
      deep:true,
      handler(){
        // 数据发生改变，就去本地更改
        localStorage.setItem('todoList',JSON.stringify(this.todoList))
      }
    }
  }
};
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>